diff --git a/include/boost/regex/config/cstring.hpp b/include/boost/regex/config/cstring.hpp
index 316f0b8c..dcc480d7 100644
--- a/include/boost/regex/config/cstring.hpp
+++ b/include/boost/regex/config/cstring.hpp
@@ -25,6 +25,7 @@
 
 #include <cstring>
 #include <cctype>
+#ifndef __sgi
 #ifdef __KCC
 #include <ios>
 #endif
@@ -226,4 +227,6 @@ using ::toupper;
 
 } // namespace std
 
+#endif // __sgi
+
 #endif
diff --git a/include/boost/regex/v4/perl_matcher_common.hpp b/include/boost/regex/v4/perl_matcher_common.hpp
index e13a4a14..69f77c21 100644
--- a/include/boost/regex/v4/perl_matcher_common.hpp
+++ b/include/boost/regex/v4/perl_matcher_common.hpp
@@ -736,7 +736,6 @@ bool perl_matcher<BidiIterator, Allocator, traits, Allocator2>::find_restart_lit
    int len = info->len;
    const char_type* x = info->pstr;
    int j = 0; 
-   bool icase = re.flags() & regex_constants::icase;
    while (position != last) 
    {
       while((j > -1) && (x[j] != traits_inst.translate(*position, icase)))